This is a simple proof of concept Discord bot that runs in Kubernetes. It uses the discord.py library to interact with Discord. This POC uses Redis to also demonstrate how a shared cache would work. This is demonstated by the !counter command that will increment a number every time it is called, no matter what pod the command is recieved by.
There are three ways you can run this bot:
just running python3 main.py will start the bot. You will need to have the DISCORD_TOKEN environment variable set to your bot's token. You will need to manually start a redis server to also be able to use the !counter command.
You can start both Redis and the bot using docker compose up -d --build. This will start a Redis server and the bot in a container. You will need to have the DISCORD_TOKEN environment variable set to your bot's token in an .env file.
A convenient script bot.sh is provided to start the bot in Kubernetes. You will need to have a Kubernetes cluster running and kubectl configured to use it (if you are completely new to Kubernetes take a look at minikube). The script will create a namespace, a deployment and a service for the bot. You will need to have the DISCORD_TOKEN environment variable set to your bot's token in an .env file. The script has 3 commands: up, down and restart. up will create the resources, down will delete them and reload will delete and recreate them.
Using minikube, running this bot in Kubernetes is as easy as running
miniukbe start
./bot.sh up